Chlorine is used as an oxidizing agent in several organic processes and hydrogen chloride is often generated as a by-product or co-product.
The recovery of chlorine from hydrogen chloride or hydrochloric acid has several advantages:
- It shows general commitment in terms of sustainability, careful use of resources and therefore ecological responsibility.
- Business is made independent from chlorine and hydrochloric acid prices.
- Avoids the need to develop traditional chlor-alkali plants with significantly higher investment costs.
- Interesting for regions with high chlorine demand or excess caustic soda (NaOH); use of a chlor-alkali plant would not be expedient due to further NaOH production in saturated markets.
- Eliminates the risks of chlorine transports (as a further alternative).
- No costs related to hydrochloric acid neutralization or disposal.
thyssenkrupp Uhde Chlorine Engineers offers two different hydrochloric acid electrolysis processes for the recovery of chlorine from hydrogen chloride:
- Membrane electrolyzer technology using the oxygen-depolarized cathode (ODC).
- Diaphragm electrolyzer technology.
Video HCl ODC electrolysis for chlorine recovery